/******************************************************************************
 *
 * MantaFlow fluid solver framework
 * Copyright 2011-2020 Tobias Pfaff, Nils Thuerey
 *
 * This program is free software, distributed under the terms of the
 * Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Helper functions to handle file IO
 *
 ******************************************************************************/

#include "mantaio.h"

#if OPENVDB==1
#	include "openvdb/openvdb.h"
#endif

#if NO_ZLIB != 1
extern "C" {
# include <zlib.h>
}

#if defined(WIN32) || defined(_WIN32)
#	include <windows.h>
#	include <string>
#endif

using namespace std;

namespace Manta {

#if defined(WIN32) || defined(_WIN32)
static wstring stringToWstring(const char *str)
{
	const int length_wc = MultiByteToWideChar(CP_UTF8, 0, str, strlen(str), NULL, 0);
	wstring strWide(length_wc, 0);
	MultiByteToWideChar(CP_UTF8, 0, str, strlen(str), &strWide[0], length_wc);
	return strWide;
}
#endif // WIN32==1

void *safeGzopen(const char *filename, const char *mode)
{
	gzFile gzfile;

# if defined(WIN32) || defined(_WIN32)
	wstring filenameWide = stringToWstring(filename);
	gzfile = gzopen_w(filenameWide.c_str(), mode);
# else
	gzfile = gzopen(filename, mode);
# endif

	return gzfile;
}
#endif // NO_ZLIB != 1

# if defined(OPENVDB)
// Convert from OpenVDB value to Manta value.
template<class S, class T>
void convertFrom(S& in, T* out) {
	errMsg("OpenVDB convertFrom Warning: Unsupported type conversion");
}

template<>
void convertFrom(int& in, int* out) {
	(*out) = in;
}

template<>
void convertFrom(float& in, Real* out) {
	(*out) = (Real) in;
}

template<>
void convertFrom(openvdb::Vec3s& in, Vec3* out) {
	(*out).x = in.x();
	(*out).y = in.y();
	(*out).z = in.z();
}

// Convert to OpenVDB value from Manta value.
template<class S, class T>
void convertTo(S* out, T& in) {
	errMsg("OpenVDB convertTo Warning: Unsupported type conversion");
}

template<>
void convertTo(int* out, int& in) {
	(*out) = in;
}

template<>
void convertTo(float* out, Real& in) {
	(*out) = (float) in;
}

template<>
void convertTo(openvdb::Vec3s* out, Vec3& in) {
	(*out).x() = in.x;
	(*out).y() = in.y;
	(*out).z() = in.z;
}
#endif // OPENVDB==1

}  // namespace
